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understand-diff

Map git diff changes to knowledge-graph nodes and write diff-overlay.json.

6|1|Updated Apr 7, 2026
Search Tags:#git#diff#code-review#knowledge-graph#pull-request#impact-analysis#dependency-analysis
One-click install
npx skills add https://github.com/kmshihab7878/claude-code-setup --skill understand-diff
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: understand-diff
Source: https://github.com/kmshihab7878/claude-code-setup/tree/main/skills/understand-diff
Command: npx skills add https://github.com/kmshihab7878/claude-code-setup --skill understand-diff

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Developers and reviewers often struggle to understand the full impact of code changes across a codebase; this Skill connects git diffs and PRs to a precomputed knowledge graph so you can quickly see what changed, what depends on it, and where to focus review and testing effort.

Core Features & Use Cases

  • Changed component discovery: Locate file, function, and class nodes in the knowledge graph that correspond to changed file paths.
  • One-hop impact analysis: Find upstream callers and downstream dependencies via edges to surface affected components and estimate blast radius.
  • Risk assessment & layers: Report affected architectural layers, complexity-based risk scoring, and reviewer guidance for high-impact changes.
  • Dashboard overlay generation: Emit a structured diff-overlay JSON for visualizing changed and affected nodes in the understand-anything dashboard.
  • Use Case: Use on a feature branch or PR to prioritize code review, identify integration risks, and generate a dashboard overlay for cross-team communication.

Quick Start

Run the understand-diff skill against the current branch to list changed files, matched knowledge-graph node IDs, one-hop affected components, risk notes, and produce the diff overlay file.

Frequently Asked Questions about understand-diff

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I analyze a git diff to identify affected components in a pull request?▼

To analyze a git diff for affected components, this skill extracts changed file paths from pull requests and maps them to nodes in a precomputed knowledge graph. It then resolves one-hop edges to identify directly changed and downstream affected components.

What is one-hop impact analysis for code changes?▼

One-hop impact analysis for code changes traces upstream callers and downstream dependencies in a knowledge graph to surface affected components. This helps estimate the blast radius of a pull request and identify integration risks.

Can I assess code review risk by mapping git diffs to a knowledge graph?▼

Yes, you can assess code review risk by matching changed files to knowledge-graph nodes. The skill evaluates affected architectural layers and provides complexity-based risk scoring to guide reviewer focus on high-impact changes.

How do I visualize the impact of uncommitted changes on architectural layers?▼

You can visualize the impact of uncommitted changes by generating a diff-overlay JSON file. The skill writes changed and affected node lists to this structured file for visualizing affected components in the understand-anything dashboard.

Do I need a knowledge graph to perform dependency analysis on a feature branch?▼

Yes, dependency analysis on a feature branch requires a repository containing a precomputed knowledge graph at .understand-anything/knowledge-graph.json. The skill uses this file to locate symbol node IDs and resolve dependency edges.

What are the limitations of using dependency analysis for code review on large pull requests?▼

A limitation of this dependency analysis is that impact mapping is restricted to one-hop edges in the knowledge graph, meaning it surfaces directly connected components without traversing deeper multi-hop dependency chains.

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